My family and I are big reusable cup fans for many reasons: they are double wall insolated, they keep your drinks hot or cold, and it reduces your waste on single plastic cup usage. One of my favorite cups is the blue Hydro Flask that I have had for close to 10 years now and I still use it daily. My wife went from "just one" Yetti cup to 4 Yetti's and a Stanley; she cycles through them regularly. When we were at the Yetti store off of Calle Barcelona in Carlsbad about a year ago, we noticed they had little cups for kids, and my wife and I could not resist and bought 2 for our two year old daughter that she uses daily as well. I highly recommend trying these reusables out, they are worth the money spent!
Zachary, this is awesome! I am glad that you both do this! YAY!